DR Congo votes amid delays and violence
Voters in DR Congo are choosing their leaders in elections marred by violence and logistical difficulties.
At least four people died after gunmen attacked polling stations in the second city, Lubumbashi, officials say.
In the opposition stronghold of West Kasai, polling stations were reportedly set on fire by voters angry at long delays but the capital, Kinshasa was generally peaceful.
It is the second election since the end of wars in which four million died.
Etienne Tshisekedi, 78, seen as the strongest opposition candidate, has accused President Joseph Kabila, 40, of planning to rig the election.
At least three people were killed on Saturday in election clashes, leading to a police ban on final campaign rallies.
Ahead of the vote, international organisations appealed for calm.
Some 22,000 UN peacekeepers are stationed around the country and are expected to help prevent any outbreaks of violence.
Helicopter deliveries
Election officials have been scrambling to get ballot papers distributed to all 60,000 of the polling stations in the country - which is two-thirds the size of Western Europe and has little transport infrastructure.
In many inaccessible areas, voting material was delivered by helicopter.
Some polling stations opened as scheduled at 06:00 local time. Because of the time difference in this continent-sized country, this was 04:00 GMT in eastern areas and an hour later in the west.
However, there have been long delays in some areas due to a lack of voting material.
The BBC’s Mamadou Moussa Ba in the south-eastern mining capital of Lubumbashi says gunmen - suspected to belong to a secessionist movement - attacked two polling stations in the city.
AFP news agency quotes a military spokesman as saying two policeman and a civilian were killed and two soldiers wounded.
The governor of the local Katanga province, Moise Katumbi, told Reuters news agency that three of the attackers had been killed and seven arrested.
Two vehicles carrying election materials were also attacked overnight just outside Lubumbashi, our reporter says.
The attackers wounded one driver and a security officer and set voting material on fire, election officials said.
Our reporter says there are lengthy delays at some polling stations, which had failed to open six hours after voting was due to start, although polling began on time in other areas.